Nurse Liu Xiangda (C) poses for photos with his colleagues Li Hangbo (1st R) and Liang Yuhu in the intensive care unit (ICU) of Zhengzhou Central Hospital in Zhengzhou, capital of central China's Henan Province, May 9, 2017. Liu, 25, is one of the over 70 male nurses working in the hospital. The number of registered nurses in China reached 3.5 million at the end of 2016, according to the latest statistics ahead of International Nurses Day, which falls on May 12. (Xinhua/Li Bo)